Battery maintainer



FIG. 1 is a perspective view of the ornamental design for the battery maintainer;

FIG. 2 is a front view of the battery maintainer of FIG. 1;

FIG. 3 is a left side view of the battery maintainer of FIG. 1;

FIG. 4 is a right side view of the battery maintainer of FIG. 1;

FIG. 5 is a top view of the battery maintainer of FIG. 1;

FIG. 6 is a bottom view of the battery maintainer of FIG. 1; and,

FIG. 7 is a back view of the battery maintainer of FIG. 1.

In these drawings, the broken lines illustrate environmental features that form no part of the claimed ornamental design. 

CLAIM The ornamental design for a battery maintainer, as shown and described. 